My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ18CA-M3/9AT
- Part No.:
- SMCJ18CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CA-M3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,805
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ18CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 20.0 V to 22.1 V breakdown voltage (VBR) at 1 mA test current, and 29.2 V maximum clamping voltage (VC) at 51.4 A peak pulse current. It protects sensitive signal lines and power rails in automotive sensor interfaces and industrial I/O modules.
For engineers reviewing the SMCJ18CA-M3/9AT datasheet, SMCJ18CA-M3/9AT pinout, SMCJ18CA-M3/9AT application, or SMCJ18CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 18 V standoff voltage (VWM), low incremental surge resistance, AEC-Q101 qualification eligibility via HM3 suffix, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage events (e.g., ISO 7637-2 pulse 1/2a/5a), it avalanches rapidly (<1 ns response) to divert surge current away from downstream ICs. Its bidirectional symmetry ensures identical clamping behavior for positive and negative transients without polarity sensitivity.
The device uses a glass-passivated silicon junction housed in an SMC package rated for 150 °C max junction temperature, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead). It meets J-STD-020 MSL Level 1 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensuring reliable avalanche initiation across production lot and temperature. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamping voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against automotive load-dump and ESD events. |
| IPPM | 51.4 A - Peak surge current capacity at rated clamping voltage; defines minimum trace width and layout clearance requirements. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad recommendation for thermal management. |
Pinout & Package
SMCJ18CA-M3/9AT is a bidirectional two-terminal device in SMC (DO-214AB) package. No polarity marking is applied; both terminals are functionally symmetric. The package features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no fixed polarity required in layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; device functions identically regardless of orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance for ± transients-eliminates need for polarity-aware placement in AC-coupled or differential signal paths. |
| 1500 W peak pulse power | Withstands high-energy surges such as ISO 7637-2 Pulse 5a (load dump) without degradation when mounted per recommended 8.0 mm × 8.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping-critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS. |
| AEC-Q101 qualification path | HM3 suffix variant (e.g., SMCJ18CA-HM3_X) is qualified for automotive applications; M3 suffix indicates halogen-free, RoHS-compliant construction. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-bag storage or baking-reduces manufacturing overhead and avoids moisture-induced popcorning. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from ISO 7637-2 load dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp fast-rising overvoltages before they reach signal conditioning circuitry. Use Value: Maintains signal integrity by limiting transient voltage to ≤29.2 V, preventing latch-up or permanent damage to 5 V tolerant transceivers and ADC front-ends. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controller (PLC) modules exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on 24 V DC field wiring to absorb repetitive 10/1000 μs surges up to 51.4 A without derating. Use Value: Extends system uptime by eliminating false triggering and component failure caused by electromagnetic interference in factory automation environments. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding Ethernet PHY interface lines (e.g., RJ45 magnetics secondary side) from lightning-induced surges and ESD per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level surge suppressor located upstream of common-mode chokes and isolation transformers to reduce energy entering the PHY IC. Use Value: Achieves >15 kV ESD immunity (IEC 61000-4-2) and 1 kV/500 A surge withstand (IEC 61000-4-5) due to low clamping voltage and fast response. |
Use Scenario: Protecting USB-C and barrel jack input stages of consumer power adapters against user-handling ESD and accidental AC line transients. IC Role / Device Role / Timing Role: Secondary-side TVS on DC input rail to prevent overvoltage propagation into primary-side controller ICs and optocouplers. Use Value: Enables compact design with only one TVS per rail-no series impedance needed-due to 18 V VWM matching typical adapter output tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18CA | Same VWM (18 V) and VC (29.2 V), but lower PPPM = 600 W and smaller SMA package (DO-214AC); 30% lower surge current rating (IPPM = 20.5 A). | Targeted at space-constrained consumer electronics where full 1500 W surge immunity is not required. | Select SAC18CA only if board area is critical and surge threat level is limited to IEC 61000-4-2 ESD (±8 kV contact). |
| SMCJ18A-M3/9AT | Unidirectional version with identical VWM, VBR, VC, and PPPM, but includes cathode band marking and forward voltage drop (VF = 3.5 V @ 100 A). | Required where DC bias polarity is fixed and reverse conduction must be blocked (e.g., DC power rail protection). | Choose SMCJ18A-M3/9AT only when unidirectional blocking is mandatory; otherwise SMCJ18CA-M3/9AT offers greater flexibility in AC or bidirectional signal paths. |
Compared with SAC18CA, SMCJ18CA-M3/9AT delivers 2.5× higher surge energy handling in the same functional category; versus SMCJ18A-M3/9AT, it eliminates polarity constraints and simplifies layout-making it optimal for differential, AC-coupled, or unknown-polarity interfaces.
Availability
SMCJ18CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, halogen-free compliance, and long-term obsolescence management.
Supply support for SMCJ18CA-M3/9AT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where consistent clamping performance and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of SMCJ18CA-M3/9AT at its rated peak pulse current?
The SMCJ18CA-M3/9AT has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated 10/1000 μs peak pulse current of 51.4 A. This value is measured per JEDEC standards and guarantees that protected circuitry will not experience voltages exceeding 29.2 V during worst-case surge events, making SMCJ18CA-M3/9AT suitable for safeguarding 24 V nominal systems and 5 V logic interfaces.
Is SMCJ18CA-M3/9AT suitable for automotive applications?
Yes, SMCJ18CA-M3/9AT is compatible with automotive use: its base P/N-M3 suffix denotes halogen-free, RoHS-compliant construction, and the HM3 variant (e.g., SMCJ18CA-HM3_A) is explicitly AEC-Q101 qualified. While the M3 version itself is not pre-qualified, it shares identical die, packaging, and electrical characteristics with the HM3 grade-enabling qualification-ready design-in for ECU, body control, and ADAS sensor protection circuits.
How does the bidirectional nature of SMCJ18CA-M3/9AT affect PCB layout?
The bidirectional nature of SMCJ18CA-M3/9AT eliminates polarity constraints: there is no cathode band or marking, and either terminal functions identically under positive or negative transients. This allows unrestricted orientation during automated placement and removes risk of misorientation-related failures-unlike unidirectional variants such as SMCJ18A-M3/9AT, which require strict attention to cathode alignment in DC-biased applications.
What is the thermal resistance of SMCJ18CA-M3/9AT, and how does it impact power dissipation?
SMCJ18CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values mean that under continuous 6.5 W power dissipation (its rated PD at TA = 50 °C), the junction temperature rise above ambient will be ~488 °C without heatsinking-hence the device is intended solely for transient, not steady-state, power handling. Layout must follow the 8.0 mm × 8.0 mm copper pad recommendation to achieve published ratings.
Does SMCJ18CA-M3/9AT meet industry-standard surge immunity requirements?
Yes, SMCJ18CA-M3/9AT meets key surge immunity standards including IEC 61000-4-5 (1 kV/500 A combination wave), ISO 7637-2 (Pulse 1, 2a, 5a), and IEC 61000-4-2 (ESD ±15 kV air, ±8 kV contact) when implemented with proper PCB layout-specifically using the recommended 8.0 mm × 8.0 mm copper pads per terminal and minimizing trace inductance between the TVS and protected node. Its 1500 W PPPM and 29.2 V VC directly support these compliance targets.
SMCJ18CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ18CA-M3/9AT FAQ
1.How can I place an order for SMCJ18CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CA-M3/9AT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMCJ18CA-M3/9AT reliable?
The price and inventory of SMCJ18CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CA-M3/9AT?
SMCJ18CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CA-M3/9AT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMCJ18CA-M3/9AT?
For technical support, including SMCJ18CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ18CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18CA-M3/9AT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMCJ18CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18CA-M3/9AT?
All SMCJ18CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CA-M3/9AT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMCJ18CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CA-M3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
